Thanks for letting us know about this.
We apologize to hear about your experience. To clarify you are experiencing the issue only on the Tubi channel? Have you checked if you have the latest channel version? To get this, click the * button on the channel tile or go to Settings for a System Update there. Then, restart your player.
If you still continue to see the issue with the channel alone, this is a good indication that there is likely an issue within that specific channel that will need to be addressed by the channel publisher. Channels on Roku are maintained by the channel developer themselves. We'll be sure to share your feedback with the channel developer to let them know about the issue you're running into.
We'd recommend continuing to follow up with them about their channel on the Roku platform for further news and status updates.